Fuel dispensing system with heating system

ABSTRACT

Embodiments of a heating system maintains the temperature of a fuel additive (e.g., AUS32) at and/or above freezing temperature to avoid crystallization. The heating system can form a fluid circuit with one or more coaxially arranged sleeves disposed about hoses that transport the additives. The fluid circuit can also include a central compartment that encloses a flow meter. A fluid heater couples with the fluid circuit to provide heating fluid, e.g., to the central compartment. The heating fluid disperses throughout the heating compartment and into the sleeves, thereby direction heating fluid in thermal proximity to the hoses and other components that handle the fuel additive.

BACKGROUND

The subject matter disclosed herein relates to fuel dispensing systemsand, in particular, to heating systems for use in fuel dispensingsystems to prevent fuel additives from crystallizing at lowtemperatures.

Vehicles that use diesel fuels emit large amounts of nitrogen oxides or,more generally, NO_(R). These emissions are harmful to the environment.Thus, techniques are in place to reduce these emissions. Selectivecatalytic reduction (SCR) is one technique that converts the NOx intodiatomic nitrogen (N₂) and water (H₂O). SCR utilizes a reductant and acatalyst. Examples of the reductant include anhydrous ammonia, aqueousammonia, and urea. Various standards and/or government regulationsestablish the proper solutions for the reductant, which in one formincludes an aqueous urea solution, commonly referred to as AUS32 andidentified in North America as Diesel Exhaust Fluid and abroad asAdBlue®.

Service stations throughout the world use dispensing systems that storeAUS32 to provide regular access for end users that operatediesel-powered vehicles. However, these dispensing systems oftenencounter problems inherent with the AUS32 fluid. One problem of primaryconcern is crystallization of the AUS32 fluid. This problem can resultin crystal build-up through the components of the dispensing system. Thebuild-up can lead to clogs and other blockages that effectively reduceflow of the AUS32 fluid and, eventually, require maintenance to restoreoperability of the dispensing system.

Crystallization can occur at low temperatures and, more specifically, atand/or below the freezing point of the AUS32 fluid. The AUS32 fluid willbegin to crystallize at about −7° C., forming a slush, and begin tosolidify at about −11° C. Unfortunately, many service stations that wishto provide the AUS32 fuel additive are found in locations wheretemperatures are consistently at or below these critical temperaturesfor extended periods of time.

Solutions are therefore necessary to prevent crystallization of theAUS32 fluid in these cold environments. One common solution utilizes alarge, heated cabinet that encloses the components of the dispensingsystem. The heated cabinet can maintain the entire dispensing system, ormost of the dispensing system, at temperatures that are above thecritical temperatures for the AUS32 discussed above. However, use of theheated cabinet, and similar heated compartments, are often considerablylarger and/or are sized to heat volumes that are much larger thannecessary to maintain the temperature of the AUS32. These features canlead to higher costs of operation (e.g., for the heaters and structure),complicate the refilling process for the end user, and suffer fromimplementation issues. For example, during a re-filling process, the enduser may need to open the cabinet to extract the nozzle and/or tocomplete the transaction. Once the re-filling process finishes, the enduser must then replace the nozzle and close the cabinet. This processrelies on the end user to properly close the cabinet door to reestablishthe integrity of the cabinet. Unfortunately, situations where thecabinet is not sufficiently closed and/or the cabinet door is left ajarafter the re-filling process is complete will defeat the operation ofthe heated cabinet and can result in freezing of the AUS32 fluid.

Other solutions utilize in-situ heating techniques to elevate andmaintain the temperature of the AUS32 fluid. These techniques mayutilize a wire, a coil, and/or other element that inserts into the hosesthat carry the fuel additive. Energizing these elements injects heatdirectly into the AUS32 fluid. However, although effective because theelements are in close proximity to the AUS32 fluid, the elements canreduce flow and pressure of the fuel additive in the hoses. Moreover, toafford heating throughout all components that handle the AUS32, and arethus at risk of crystallization, the dispensing system is likely torequire different in-situ heating techniques with special designs forthe components, e.g., hoses, nozzles, etc. This requirement can addcosts and complexity to the design.

Still other solutions attempt to maintain movement of the AUS32 fluid,e.g., when the dispensing system is not in use. These systems deployintricate fluid systems that allow the AUS32 to circulate continuously,thereby preventing stagnate conditions that can allow crystallization tooccur. However, circulating systems also require complicated structureto maintain proper circulation of the AUS32 fluid as well as to avoidleaks and other problems that can lead to effluent from the dispensingsystem.

SUMMARY

This disclosure describes improvements to heating systems that canprevent crystallization of fuel additives, e.g., AUS32. Theseimprovements focus heating on the components that handle the fueladditive and, thus, avoids risks of clogging and blockage due to crystalbuild-up in these components. This proposed heating system, however,right-sizes the configuration of the heating system to these at-riskcomponents, which can reduce costs associated with materials and powerusage. As discussed more below, the proposed designs utilizes a closedand/or partially-closed compartment structure that insulates the fueladditive-handling components. These components include the hoses andpipes that transfer the fuel additive, as well as the nozzles and meterswith geometries that often drive the size requirements of conventionalheated cabinet designs. Examples of this compartment structure can forma fluid circuit that allows heating fluid (e.g., air) to pass in closeproximity to components that handle the fuel additive. In otherexamples, the heating system can include a heating element that providesdirect heating of the fuel additive.

BRIEF DESCRIPTION OF DRAWINGS

Reference is now made briefly to the accompanying Appendix, in which:

FIG. 1 depicts a schematic diagram of a partial cross-section of anexemplary embodiment of a heating system as part of a fuel dispensingsystem;

FIG. 2 depicts a side view of the fuel dispensing system of FIG. 1;

FIG. 3 depicts a schematic diagram of an exemplary embodiment of aheating system with a fluid circuit for circulating heating fluid;

FIG. 4 depicts a cross section of the fluid circuit taken at line 4-4 ofFIG. 3 to illustrate a coaxial configuration of components in the fluidcircuit;

FIG. 5 depicts an exemplary flow pattern that results from operation ofa fluid heater in the heating system of FIG. 3;

FIG. 6 depicts a schematic diagram of an exemplary embodiment of aheating system with a fluid circuit for circulating heating fluid tonozzles of the dispensing system;

FIG. 7 depicts a schematic diagram of an exemplary embodiment of aheating system with a pair of fluid circuit for circulating heatingfluid;

FIG. 8 depicts a schematic diagram of an exemplary embodiment of aheating system that incorporates a heating element to directly heat thefuel additive;

FIG. 9 depicts a schematic diagram of an exemplary embodiment of aheating system that incorporates one or more wires to directly heat thefuel additive; and

FIG. 10 depicts a schematic wiring diagram of an exemplary controldevice to maintain temperature in a heating system.

Where applicable like reference characters designate identical orcorresponding components and units throughout the several views, whichare not to scale unless otherwise indicated.

DETAILED DISCUSSION

FIG. 1 depicts a schematic diagram to illustrate an exemplary embodimentof a heating system 100 of the present disclosure. The heating system100 is part of a fluid dispensing system 102 (also “system 102”) thatincludes a storage tank 104 and a dispenser unit 106. The dispensingsystem 102 also includes a hose 108 that places the dispenser unit 106in flow connection with the storage tank 104. Examples of the dispensingsystem 102 can dispense fuel additives, e.g., Diesel Exhaust Fluid(DEF), urea resin, and similar fuel additives that reduce NOx emissionsin diesel-powered vehicles.

As set forth more below, the heating system 100 manages the temperatureof the fuel additive to avoid crystallization and/or solidification.This feature allows the dispensing system 102 to operate in coldenvironments with temperatures that fall below the freezing point of thefuel additives. Embodiments of the heating system 100, for example, canform a compartment structure that is sized and configured about the fueladditive-handling components of the dispenser unit 106. This componentstructure can insulate these components, thus helping to maintain thetemperature of the fuel additive in cold environments.

In addition to the compartment structure, the heating system 100 canincorporate various heating schemes that elevate the temperature of thefuel additive. These heating schemes can circulate heating fluid inclose proximity to the hoses, meters, nozzles, and other components ofthe dispenser unit 106 that handle the fuel additive. In other examples,the heating system 100 can inject thermal energy directly into the fueladditive, e.g., via one or more immersion heaters. These configurationsmaintain the temperature of the fuel additive at and/or above thefreezing point, thus preventing crystals from forming (or“crystallization”) in the fuel additive in these components. Thesecrystals can clog the flow path of the fuel additive, which ultimatelycan disrupt operation of the dispenser unit 106. Moreover,solidification (or freezing) of the fuel additive solidify (or freeze)can rupture the hoses and other components of the dispenser unit 106.The resulting damage can bring the dispenser unit 106 offline forextended periods of time due to the extensive repairs necessary toreplace the damaged components.

In FIG. 1, the dispenser unit 106 includes a nozzle assembly 110 andvarious control and operation elements (e.g., a display 112 and apayment device 114). The dispenser unit 106 also includes a compartment115 with a flow meter 116, a fluid inlet 118, and a fluid outlet 120.The fluid inlet 118 and the fluid outlet 120 can comprise fluid-carryingcomponents (e.g., hoses, pipes, couplings, and/or the like) that allowfluid flow therethrough. Examples of the fluid-carrying components aremade of materials compatible with the fuel additive. In one example, thefluid inlet 118 couples with hose 108 to allow fuel additive to enterthe dispenser unit 106. The fluid outlet 118 can extend from the flowmeter 116 to the nozzle assembly 110 as a single unitary member (e.g., ahose) and/or in constructions that utilize multiple pieces (e.g.,multiple hoses and fluid couplings disposed therebetween). Both singleand multi-piece configurations of components place the nozzle assembly110 in flow connection with the flow meter 116. During operation of thedispenser unit 106, the fuel additive flows from the storage tank 104 tothe flow meter 116 via the fluid inlet 118, through the flow meter 116,and from the flow meter 116 to the nozzle assembly 110 via the fluidoutlet 120. The fuel additive flows through the nozzle assembly 110until the fuel additive dispenses, e.g., into a tank on a diesel-poweredvehicle.

FIG. 2 illustrates a side view of the dispensing system 102, e.g., takenat line 2-2 of FIG. 1. As shown in the diagram of FIG. 2, the nozzleassembly 110 can include one or more nozzles (e.g., a first nozzle 122and a second nozzle 124). The nozzle assembly 110 also has one or morecover system (e.g., a first cover system 126 and a second cover system128) that house the nozzles 122, 124. The cover systems 126, 128 includea nozzle boot 130 and a cover 132 which surrounds the nozzles 122, 124to provide a nozzle volume 134.

Construction of the cover systems 126, 128 permits the cover 132 totranslate from a first position, shown in FIG. 1, to a second positionthat is different from the first position. The second position permitsaccess to the nozzles 122, 124, e.g., to allow the end user to removethe nozzles 122, 124 from the nozzle boot 130 to dispense fuel additive.When the nozzles 122, 124 reside on the nozzle boot 130, e.g., when thenozzles 122, 124 are in the first position and the fuel dispenser 106 isnot in use, the covers 132 cover the nozzles 122, 124 to form the nozzlevolume 134.

In one embodiment, the heating system 100 can circulate heating fluid tothe nozzle assembly 110. The heating fluid disperses into the nozzlevolume 134, which elevates the temperature, e.g., of air, inside of thenozzle volume 134 proximate the nozzles 122, 124. This feature preventscrystallization of the fuel additive in the nozzles 122, 124, whichoften contains residual fuel additive that is left over betweendispensing operations.

FIG. 3 depicts a schematic diagram of an exemplary embodiment of aheating system 200 that can prevent crystallization of fuel additives.The heating system 200 forms a fluid circuit in the dispenser 206. Thefluid circuit includes a central compartment 236 and one or moreelongated sleeves (e.g., a first elongated sleeve 238, a secondelongated sleeve 240, and a third elongated sleeve 242). The fluidcircuit 235 can operate as a closed-loop and/or semi-closed loop systemthat carries heating fluid proximate components (e.g., the flow meter216, the fuel inlet 218, and the fuel outlet 220) that handle the fueladditive. In one example, the heating system 200 includes a fluid heater244, which is shown in flow connection with the central compartment 236.

Examples of the fluid heater 244 include devices that inject heatingfluid into the fluid circuit at elevated temperatures. These devices mayhave a heating element and fluid moving element (e.g., a fan, a pump,etc.) that allow the fluid heater 244 to, respectively, heat andpressurize the heating fluid. Although shown in FIG. 3 as coupled withthe central compartment 236, this disclosure further contemplatesconfigurations for the heating system 200 in which the location of thefluid heater 244 is remote from the heating system 200. Theseconfigurations may require additional fluid-carrying components thatcouple the fluid heater 244 with heating system 200 and, in one example,a hose that places the fluid heater 244 in flow connection with thecentral compartment 236.

The central compartment 236 can form a sealed (and/or partially sealed)enclosure about the flow meter 216. This enclosure has properties thatprevent thermal conduction of heat from the inside of the enclosure tothe outside of the enclosure. For example, the enclosure can compriseinsulation and other materials with relatively low thermal conductivity.These materials may form one or more walls of the enclosure and/or mayfind use as a liner that is disposed on an outer shell that forms thegeneral structure of the central compartment 236.

The elongated sleeves 238, 240, 242 couple with the central compartment236 to allow heating fluid to flow along the hoses and pipes of the fuelinlet 218 and the fuel outlet 220. This configuration disperses theheating fluid proximate the surface of the hoses and pipes to maintainthe temperature along these components above the freezing point of thefuel additive. Devices for use as the elongated sleeves 238, 240, 242fit about these hoses and pipes to form a coaxial fluid pathway to allowthe heating fluid to pass between the outer surface of the hoses andpipes and the inner surface of the elongated sleeves 238, 240, 242.

FIG. 4 depicts a cross-section view of the elongated sleeve 240 taken atthe line 4-4 of FIG. 3 to illustrate an example of the coaxial fluidpathway. In FIG. 4, the elongated sleeve 240 has an outer sleeve surface246 and an inner sleeve surface 248 that bounds a first flow area 250.The fluid inlet 220 includes a hose with an outer hose surface 252 andan inner hose surface 254 that bounds a second flow area 256. As shownin FIG. 4, the size of the hose is smaller is relative to the size ofthe elongated sleeve 240, thus forming a gap 258 between the innersleeve surface 248 and the outer hose surface 254. When implemented aspart of the heating system 200 (FIG. 3), heating fluid can flow in thegap 258 and along the outer hose surface 254. This feature allowsthermal energy to transfer from the heating fluid to the outer hosesurface 254. The transfer raises and/or maintains the temperature of thehose at and/or above the freezing point of the fuel additive.

FIG. 5 illustrates an exemplary flow pattern for heating fluid thattravels in the coaxial pathway of the heating system 200. This flowpattern shows the distribution of heating fluid from, e.g., the fluidheater 244, about the central compartment 236 and into the elongatedsleeves 238, 240, 242. As shown in FIG. 5, the coaxial pathway canextend to the nozzles 222, 224 to allow heating fluid to flow along theentirety of the hoses that supply fuel additive to the nozzles 222, 224.Although not shown as part of the flow pattern, this disclosurecontemplates configurations of the heating system 200 in which the flowpattern allows heating fluid to circulate, and/or re-circulate, aboutthe fluid circuit of the proposed designs. To this end, the heatingsystem 200 may utilize a pressure-release mechanism and/or slow leakconfiguration in one or more components of the heating system 200 toexhaust heating fluid from the fluid circuit. This feature preventspressurization of the fluid circuit that would prevent movement ofheating fluid, e.g., as shown in the flow pattern of FIG. 5.

FIG. 6 depicts a schematic diagram of an exemplary embodiment of aheating system 300 that illustrates one configuration to distributeheating fluid in the dispensing unit 306 and, in particular, into thenozzle volume 334 of the cover systems 326, 328. This configurationmaintains the temperature of fuel additive that may reside in thenozzles 322, 324. In the example of FIG. 6, the heating system 300includes one or more nozzle fluid paths (e.g., a first nozzle fluid path360 and a second nozzle fluid path 362). The nozzle fluid paths 360, 362couple with the fluid circuit, e.g., at the central compartment 326, andto nozzle volume (e.g., nozzle volume 134 of FIG. 2). This configurationexposes the nozzles to heating fluid that flows from the enclosure ofthe central compartment 326. In one example, one or more of the nozzlefluid paths 360, 362 couple with other parts of the fluid circuit, e.g.,the elongated sleeves to provide the supply of heating fluid into thenozzle volume (e.g., nozzle volume 134 of FIG. 2).

Turning next to FIG. 7, an exemplary embodiment of a heating system 400can include one or more separate fluid circuits to distribute heatingfluid about the components that handle the fuel additive. As FIG. 7illustrates, the heating system 400 can include a first fluid circuit464 and a second fluid circuit 466. The first fluid circuit 464, as setforth above, circulates heating fluid proximate the flow meter 416 andalong the fluid inlet 418 and the fluid outlet 420. The second fluidcircuit 466 can include the nozzle fluid paths 460, 462 and, in oneexample, a nozzle heater 468. In one implementation, the nozzle heater468 includes one or more devices that inject heating fluid into thenozzle fluid paths 460, 462 to circulate into the nozzle volume 434 ofthe cover systems 426, 428 to maintain the temperature of fuel additivein the nozzles 422, 424.

FIGS. 8 and 9 illustrate configurations of heating systems that injectthermal energy directly into the fuel additive. The diagram of FIG. 8,for example, depicts an exemplary embodiment of a heating system 500that includes a heating element 570 in the flow path of the fueladditive from the fuel inlet 518 to the flow meter 516. The heatingsystem 600 of FIG. 9 includes another exemplary heating element in theform of an elongated wire and/or filament 672 that inserts into one ormore of the fuel inlet 618 and the fuel outlets 620. Examples of theheating element 570 and the wires 672 can include devices that generatethermal energy to elevate the temperature of the fuel additive, e.g., asthe fuel additive flows through the fuel dispenser 506. These devicesmay require an input, e.g., electrical signals having specified currentand/or voltage to stimulate the thermal energy. In one example, the fueldispenser 506, 606 is configured to circulate the fuel additive amongthe components (e.g., the flow meter 516, 616 the fuel inlet 518, 618the fuel outlet 520, 620 and/or the nozzles 522, 622 and nozzles 524,624). Circulation facilitates contact of the fuel additive with theheating element 570 and the wires 672 to maintain the elevatedtemperature of the fuel additive when the fuel dispenser 506, 606 is notin use to dispense the fuel additive.

Collectively, the central compartment (e.g., central compartment 536,636) and the elongated sleeves (e.g., elongated sleeves 538, 540, 542and elongated sleeves 638, 640, 642) can form a unitary and/or partiallyunitary chamber and/or compartment. This chamber insulates thecomponents that carry the fuel additive. This configuration limitsdissipation of heat energy from the fuel additive, thereby promotingeffective heating and temperature maintenance of the fuel additive bythe heating element 570 and the wires 672.

Furthermore, this disclosure contemplates combinations of one or moreheating concepts to maintain and/or elevate the temperature of fueladditive. For example, the insulating chambers (as shown in FIGS. 8 and9) can also operate as fluid circuits to allow heating fluid to traverseamong the components of the dispenser. Such combinations of concepts mayprovide favorable temperature maintenance for particularly harsh, coldclimates.

FIG. 10 depicts a schematic diagram that presents, at a high level, awiring schematic for an embodiment of a heating system 700 that canmaintain temperature inside of fuel dispensers above the freezing pointof fuel additives. The heating system 700 includes a control device 774with a processor 776, a memory 778, and control circuitry 780. Busses782 couple the components of the control device 774 together to permitthe exchange of signals, data, and information from one component toanother in the heating system 700. In one example, the control circuitry780 includes sensing circuitry 784 that couples with one or more sensingdevices (e.g., a first sensing device 786). The control circuitry 780can also include heater drive circuitry 788 that couples with one ormore heaters (e.g., the fluid heater 744 and the nozzle heater 768). Asalso shown in FIG. 10, memory 778 can include one or more softwareprograms 790 in the form of software and/or firmware, each of which cancomprise one or more executable instructions configured to be executedby the processor 776.

In one implementation, this configuration of components can properlyelevate the temperature within the heating system 700. For example, thecontrol device 774 can receive signals from the sensing device 786 thatcontain and/or embed information about the temperature in and around thefluid circuit of the heating system 700 and/or of the fuel additive. Thecontrol device 774 can process these signals to generate an output that,in one example, includes instructions to operate one or more of theheaters (e.g., the fluid heater 744, the nozzle heater 768, the heatingelement 770, and/or wires 772). For example, these instructions maycause the fluid heater 744 to turn on to circulate heating fluid whenthe temperature fails to satisfy a threshold criteria (e.g., is lessthan a threshold minimum temperature). On the other hand, theinstructions may also cause the fluid heater 744 to turn off to stopheating fluid from circulating, e.g., when the temperature satisfies thethreshold criteria (e.g., is greater than the threshold minimumtemperature). In this way, the control device 774 can manage bothtemperature of the components that the heating system 700 heats as wellas power consumption of the heater device 744.

The control device 774 (and the other components of heating system 700)and its constructive components can communicate amongst themselvesand/or with other circuits (and/or devices), which execute high-levellogic functions, algorithms, as well as executable instructions (e.g.,firmware instructions, software instructions, software programs, etc.).Exemplary circuits of this type include discrete elements such asresistors, transistors, diodes, switches, and capacitors. Examples ofthe processor 776 include microprocessors and other logic devices suchas field programmable gate arrays (“FPGAs”) and application specificintegrated circuits (“ASICs”). Although all of the discrete elements,circuits, and devices function individually in a manner that isgenerally understood by those artisans that have ordinary skill in theelectrical arts, it is their combination and integration into functionalelectrical groups and circuits that generally provide for the conceptsthat are disclosed and described herein.

The structure of the components in the control device 774 can permitcertain determinations as to selected configurations and desiredoperating characteristics for the heating system 700. An end user canconvey this information via a graphical user interface or the controldevice 774 can retrieve this information, e.g., from a central databaseand/or computer. In lieu of software and firmware, the control device700 may instead utilize electrical circuits that can physically manifestthe necessary logical operations and/or can replicate in physical forman algorithm, a comparative analysis, and/or a decisional logic tree,each of which operates to assign outputs and/or a value to outputs thatcorrectly reflects one or more of the nature, content, and origin of thechanges that occur and that are reflected by the signals the controldevice 774 receives, e.g., at the control circuitry 780.

In one embodiment, the processor 776 is a central processing unit (CPU)such as an ASIC and/or an FPGA that is configured to instruct and/orcontrol operation of one or more devices. This processor can alsoinclude state machine circuitry or other suitable components capable ofcontrolling operation of the components as described herein. The memory778 includes volatile and non-volatile memory and can store executableinstructions in the form of and/or including software (or firmware)instructions and configuration settings. Each of the control circuitry780 can embody stand-alone devices such as solid-state devices. Examplesof these devices can mount to substrates such as printed-circuit boardsand semiconductors, which can accommodate various components includingthe processor 776, the memory 778, and other related circuitry tofacilitate operation of the control device 774.

However, although FIG. 10 shows the processor 776, the memory 778, andthe components of the control circuitry 780 as discrete circuitry andcombinations of discrete components, this need not be the case. Forexample, one or more of these components can comprise a singleintegrated circuit (IC) or other component. As another example, theprocessor 776 can include internal program memory such as RAM and/orROM. Similarly, any one or more of functions of these components can bedistributed across additional components (e.g., multiple processors orother components).

As used herein, an element or function recited in the singular andproceeded with the word “a” or “an” should be understood as notexcluding plural said elements or functions, unless such exclusion isexplicitly recited. Furthermore, references to “one embodiment” of theclaimed invention should not be interpreted as excluding the existenceof additional embodiments that also incorporate the recited features.

This written description uses examples to disclose the invention,including the best mode, and also to enable any person skilled in theart to practice the invention, including making and using any devices orsystems and performing any incorporated methods. The patentable scope ofthe invention is defined by the claims, and may include other examplesthat occur to those skilled in the art. Such other examples are intendedto be within the scope of the claims if they have structural elementsthat do not differ from the literal language of the claims, or if theyinclude equivalent structural elements with insubstantial differencesfrom the literal language of the claims.

What is claimed is:
 1. A heating system for a fuel dispenser, saidheating system comprising: a central compartment having an inlet and anoutlet; and an elongated sleeve coupled with the central enclosure, theelongated sleeve circumscribing a hose that carries the fuel additive inthe fuel dispenser.
 2. The heating system of claim 1, further comprisinga fluid moving device in flow connection with the central compartment todisperse a heating fluid into the central enclosure.
 3. The heatingsystem of claim 2, wherein the central compartment and the elongatedsleeve form a fluid circuit, the fluid circuit including a coaxial fluidpathway with a gap formed by an inner surface of the elongated sleeveand an outer surface of the hose.
 4. The heating system of claim 1,further comprising a heating element in thermal contact with the fueladditive.
 5. The heating system of claim 4, wherein the heating elementcomprises a wire disposed in the hose, and wherein the wire generatesthermal energy in response to a electrical signal.
 6. The fluid circuitof claim 1, wherein the central compartment forms an enclosure that fitsabout a flow meter of the dispenser, and wherein the enclosure has aheated volume that is less than a cabinet volume for a cabinet in whichthe flow meter is located in the fuel dispenser.
 7. The fluid circuit ofclaim 1, wherein the elongated sleeve couples in flow connection with anozzle volume formed by a cover system on the fuel dispenser.
 8. Thefluid circuit of claim 7, further comprising a first heater and a secondheater, wherein the first heater couples in flow connection with thecentral compartment and the second heater couples in flow connectionwith the nozzle volume.
 9. A device for dispensing a fuel additive, saiddevice comprising: a flow meter; a hose that carries the fuel additivefrom the flow meter; and a compartment structure with a centralcompartment enclosing the flow meter and an elongated sleeve coupledwith the central compartment and circumscribing the hose.
 10. The deviceof claim 9, wherein the elongated sleeve has an inner surfacecircumscribing a first flow area that is larger than a second flow areaof the hose.
 11. The device of claim 9, further comprising a first fluidheater coupled in flow connection with the compartment structure todisperse a heating fluid therein.
 12. The device of claim 11, furthercomprising a second fluid heater coupled in flow connection with anozzle volume that surrounds a nozzle coupled to the hose.
 13. Thedevice of claim 9, further comprising a heating element in thermalcontact with the fuel additive.
 14. The device of claim 13, wherein theheating element comprises a wire disposed in the hose.
 15. A fueldispenser, comprising: a first nozzle; a first hose coupled with thefirst nozzle; an elongated sleeve circumscribing the first hose; and acentral compartment coupled with the elongated sleeve, wherein theelongated sleeve and the central compartment form a fluid circuit thatcan receive a heating fluid, and wherein the central compartment formsan enclosure with a volume that is less than a cabinet volume for acabinet in which the flow meter is located in the fuel dispenser. 16.The fuel dispenser of claim 15, further comprising a first fluid heaterin flow connection with the central compartment.
 17. The fuel dispenserof claim 16, further comprising a cover system with a nozzle boot and acover which forms a nozzle volume about the nozzle, wherein the fluidcircuit couples in flow connection with the nozzle volume to allow theheating fluid to disperse therein.
 18. The fuel dispenser of claim 17,wherein the fluid circuit comprises a first fluid circuit and a secondfluid circuit that include, respectively, a first heater and a secondheater, and wherein the first heater couples in flow connection with thecentral compartment and the second heater couples in flow connectionwith the nozzle volume.
 19. The fuel dispenser of claim 15, furthercomprising a sensor that monitors temperature of one of the nozzlevolume and the fuel additive.
 20. The fuel dispenser of claim 19,further comprising a control device comprising a processor, memory, andcircuitry coupled with the sensor and with a nozzle heater, wherein thecontrol device comprises executable instructions that are stored onmemory and configured to be executed by the processor, the executableinstruction comprising instructions for receiving a signal from thesensor and generating an output in response to the signal withinstructions to change operation of the first heater.